Abstract: Provided is a workpiece grinding method that is applied when a circular plate-shaped workpiece which has a first surface and a second surface on an opposite side of the first surface is to be ground. The workpiece grinding method includes a first grinding step of grinding the workpiece to form a circular plate-shaped first thin plate portion and an annular first thick plate portion that surrounds the first thin plate portion and that has an inner side surface at least part of which is inclined with respect to the second surface, and a second grinding step of grinding the workpiece to form a circular plate-shaped second thin plate portion that is larger in diameter but thinner than the first thin plate portion and an annular second thick plate portion that surrounds the second thin plate portion.

Abstract: A workpiece grinding method including a first surface protection step of covering a front surface of a workpiece with a workpiece protective member, a second surface protection step of covering front surface of a support substrate with a support substrate protective member, a workpiece unit formation step of causing an adhesive to spread over a side surface of an outer peripheral portion of the workpiece to fix the side surface to the support substrate, and forming a workpiece unit, a grinding step of thinning the workpiece, a first peeling step of peeling off the workpiece after thinning, the workpiece protective member, the adhesive, and the support substrate protective member from the support substrate as one unit in such a manner to turn them over, and a second peeling step of peeling off the workpiece protective member, the adhesive, and the support substrate protective member as one unit from the workpiece.

Abstract: A workpiece grinding method including a first surface protection step of covering a front surface of a workpiece with a workpiece protective member, a second surface protection step of covering front surface of a support substrate with a support substrate protective member, a workpiece unit formation step of causing an adhesive to spread over a side surface of an outer peripheral portion of the workpiece to fix the side surface to the support substrate, and forming a workpiece unit, a grinding step of thinning the workpiece, a first peeling step of peeling off the workpiece after thinning, the workpiece protective member, the adhesive, and the support substrate protective member from the support substrate as one unit in such a manner to turn them over, and a second peeling step of peeling off the workpiece protective member, the adhesive, and the support substrate protective member as one unit from the workpiece.

Abstract: A lithium/nickel/cobalt/manganese-containing composite oxide powder represented by the formula LipNixCoyMnzMqO2-aFa (wherein M is at least one element selected from the group consisting of Al, Ge, Sn, alkaline earth metal elements and transition metal elements other than Co, Mn and Ni, 0.9?p?1.1, 0.2?x?0.5, 0.2?y?0.5, 0.1?z?0.4, 0?q?0.5, 1.9?a?2.1, p+x+y+z+q=2, and 0?a?0.02), characterized in that when the powder is classified into small particle size-classified particles with an average particle size 2 ?m?D50?8 ?m and large particle size-classified particles with an average particle size of 10 ?m?D50?75 ?m, the ratio of (% by weight of the small particle size-classified particles)/(% by weight of the large particle size-classified particles) is from 15/85 to 40/60.

Abstract: The present invention provides a lithium-containing composite oxide for a positive electrode for a lithium secondary battery, which has a large volume capacity density and high safety, and excellent durability for charge and discharge cycles and charge and discharge rate property, and its production method. The lithium-containing composite oxide is represented by the general formula LipNxMyOzFa (where N is at least one element selected from the group consisting of Co, Mn and Ni, M is at least one element selected from the group consisting of Al, Sn, alkaline earth metal elements and transition metal elements other than Co, Mn and Ni, 0.9?p?1.2, 0.965?x<2.00, 0<y?0.035, 1.9?z?4.2, and 0?a?0.

Abstract: Coagulated particles of nickel-cobalt-manganese hydroxide wherein primary particles are coagulated to form secondary particles are synthesized by allowing an aqueous solution of a nickel-cobalt-manganese salt, an aqueous solution of an alkali-metal hydroxide, and an ammonium-ion donor to react under specific conditions; and a lithium-nickel-cobalt-manganese-containing composite oxide represented by a general formula, LipNixMn1-x-yCoyO2-qFq (where 0.98?p?1.07, 0.3?x?0.5, 0.1?y?0.38, and 0?q?0.05), which is a positive electrode active material for a lithium secondary cell having a wide usable voltage range, a charge-discharge cycle durability, a high capacity and high safety, is obtained by dry-blending coagulated particles of nickel-cobalt-manganese composite oxyhydroxide formed by making an oxidant to act on the coagulated particles with a lithium salt, and firing the mixture in an oxygen-containing atmosphere.

Abstract: To provide a lithium/nickel/cobalt/manganese-containing composite oxide powder which has a high weight capacity density, a high packing property, an excellent cycle property, an excellent discharge rate property and an excellent safety, and which has little content of free alkalis and is free from gelation at a time of producing a slurry. A lithium/nickel/cobalt/manganese-containing composite oxide powder represented by the formula LipNixCoyMnzMqO2-aFa (wherein M is at least one element selected from the group consisting of Al, Ge, Sn, alkaline earth metal elements and transition metal elements other than Co, Mn and Ni, 0.9?p?1.1, 0.2?x?0.5, 0.2?y?0.5, 0.1?z?0.4, 0?q?0.05, 1.9?2-a?2.1, p+x+y+z+q=2, and 0?a?0.

Abstract: The present invention provides a lithium-containing composite oxide for a positive electrode for a lithium secondary battery, which has a large volume capacity density and high safety, and excellent durability for charge and discharge cycles and charge and discharge rate property, and its production method. The lithium-containing composite oxide is represented by the general formula LipNxMyOzFa (where N is at least one element selected from the group consisting of Co, Mn and Ni, M is at least one element selected from the group consisting of Al, Sn, alkaline earth metal elements and transition metal elements other than Co, Mn and Ni, 0.9?p?1.2, 0.965?x<2.00, 0<y?0.035, 1.9?z?4.2, and 0?a?0.

Abstract: Coagulated particles of nickel-cobalt-manganese hydroxide wherein primary particles are coagulated to form secondary particles are synthesized by allowing an aqueous solution of a nickel-cobalt-manganese salt, an aqueous solution of an alkali-metal hydroxide, and an ammonium-ion donor to react under specific conditions; and a lithium-nickel-cobalt-manganese-containing composite oxide represented by a general formula, LipNixMn1-x-yCoyO2-qFq (where 0.98?p?1.07, 0.3?x?0.5, 0.1?y?0.38, and 0?q?0.05), which is a positive electrode active material for a lithium secondary cell having a wide usable voltage range, a charge-discharge cycle durability, a high capacity and high safety, is obtained by dry-blending coagulated particles of nickel-cobalt-manganese composite oxyhydroxide formed by making an oxidant to act on the coagulated particles with a lithium salt, and firing the mixture in an oxygen-containing atmosphere.

Abstract: It is to provide a cathode active material powder for a positive electrode for a lithium secondary battery, which has a large volume capacity density, high safety and excellent durability for charge and discharge cycles. A cathode active material powder for a lithium secondary battery characterized by comprising a first composite oxide powder represented by the formula (1) LipQxMyOzFa (wherein Q is Co or Mn, M is aluminum or an alkaline earth metal element or a transition metal element other than Q, provided that when Q is Co, 0.9?p?1.1, 0.980?x?1.000, 0?y?0.02, 1.9?z?2.1, x+y=1, and 0?a?0.02, and when Q is Mn, 1?p?1.3, x=2?y, 0?y?0.05, z=4, and a=0), having an average particle size D50 of from 5 to 30 ?m, and having a compression breaking strength of at least 40 MPa; and a second composite oxide powder represented by the formula (2) LipNixCoyMnzNqOrFa (wherein N is aluminum or an alkaline earth metal element or a transition metal element other than Ni, Co and Mn, 0.9?p?1.1, 0.2?x?0.8, 0?y?0.4, 0?z?0.

Abstract: Coagulated particles of nickel-cobalt-manganese hydroxide wherein primary particles are coagulated to form secondary particles are synthesized by allowing an aqueous solution of a nickel-cobalt-manganese salt, an aqueous solution of an alkali-metal hydroxide, and an ammonium-ion donor to react under specific conditions; and a lithium-nickel-cobalt-manganese-containing composite oxide represented by a general formula, LipNixMn1-x-yCoyO2-qFq (where 0.98?p?1.07, 0.3?x?0.5, 0.1?y?0.38, and 0?q?0.05), which is a positive electrode active material for a lithium secondary cell having a wide usable voltage range, a charge-discharge cycle durability, a high capacity and high safety, is obtained by dry-blending coagulated particles of nickel-cobalt-manganese composite oxyhydroxide formed by making an oxidant to act on the coagulated particles with a lithium salt, and firing the mixture in an oxygen-containing atmosphere.

Abstract: To provide a lithium-nickel-cobalt-manganese composite oxide powder for a positive electrode of a lithium secondary battery, which has a large volume capacity density and high safety and is excellent in the charge and discharge cyclic durability. A positive electrode active material powder for a lithium secondary battery characterized by comprising a first granular powder having a compression breaking strength of at least 50 MPa and a second granular powder having a compression breaking strength of less than 40 MPa, formed by agglomeration of many fine particles of a lithium composite oxide represented by the formula LipNixCoyMnzMqO2-aFa (wherein M is a transition metal element other than Ni, Co and Mn, Al or an alkaline earth metal element, 0.9?p?1.1, 0.2?x?0.8, 0?y?0.4, 0?z?0.5, y+z>0, 0?q?0.05, 1.9?2?a?2.1, x+y+z+q=1 and 0?a?0.02) to have an average particle size D50 of from 3 to 15 ?m, in a weight ratio of the first granular powder/the second granular powder being from 50/50 to 90/10.

Abstract: It is to provide a cathode active material powder for a positive electrode for a lithium secondary battery, which has a large volume capacity density, high safety and excellent durability for charge and discharge cycles. A cathode active material powder for a lithium secondary battery characterized by comprising a first composite oxide powder represented by the formula (1) LipQxMyOzFa (wherein Q is Co or Mn, M is aluminum or an alkaline earth metal element or a transition metal element other than Q, provided that when Q is Co, 0.9?p?1.1, 0.980?x?1.000, 0?y?0.02, 1.9?z?2.1, x+y=1, and 0?a?0.02, and when Q is Mn, 1?p?1.3, x=2?y, 0?y?0.05, z=4, and a=0), having an average particle size D50 of from 5 to 30 ?m, and having a compression breaking strength of at least 40 MPa; and a second composite oxide powder represented by the formula (2) LipNixCoyMnzNqOrFa (wherein N is aluminum or an alkaline earth metal element or a transition metal element other than Ni, Co and Mn, 0.9?p?1.1, 0.2?x?0.8, 0?y?0.4, 0?z?0.

Abstract: Coagulated particles of nickel-cobalt-manganese hydroxide wherein primary particles are coagulated to form secondary particles are synthesized by allowing an aqueous solution of a nickel-cobalt-manganese salt, an aqueous solution of an alkali-metal hydroxide, and an ammonium-ion donor to react under specific conditions; and a lithium-nickel-cobalt-manganese-containing composite oxide represented by a general formula, LipNixMn1-x-yCoyO2-qFq (where 0.98?p?1.07, 0.3?x?0.5, 0.1?y?0.38, and 0?q?0.05), which is a positive electrode active material for a lithium secondary cell having a wide usable voltage range, a charge-discharge cycle durability, a high capacity and high safety, is obtained by dry-blending coagulated particles of nickel-cobalt-manganese composite oxyhydroxide formed by making an oxidant to act on the coagulated particles with a lithium salt, and firing the mixture in an oxygen-containing atmosphere.

Abstract: There is obtained an active material for a lithium secondary battery that has a wide usable voltage range, a high charge-discharge cycle durability, a high capacity and high safety and availability. The particles of a lithium-nickel-cobalt-manganese-fluorine-containing composite oxide having an R-3m rhombohedral structure represented by a general formula LipNixMn1-x-yCoyO2-qFq (where 0.98?p?1.07, 0.3?x?0.5, 0.1?y?0.38, and 0?q?0.05), and the particles of the lithium-nickel-cobalt-manganese-fluorine-containing composite oxide characterized in that the half-width of the diffraction peak of a (110) plane whose 2? is 65±0.5° in the X-ray diffraction using a Cu—K? line is, 0.12 to 0.25° are used as an active substance for a positive electrode.

Abstract: To provide a lithium-nickel-cobalt-manganese composite oxide powder for a positive electrode of a lithium secondary battery, which has a large volume capacity density and high safety and is excellent in the charge and discharge cyclic durability. A positive electrode active material powder for a lithium secondary battery characterized by comprising a first granular powder having a compression breaking strength of at least 50 MPa and a second granular powder having a compression breaking strength of less than 40 MPa, formed by agglomeration of many fine particles of a lithium composite oxide represented by the formula LipNixCoyMnzMqO2-aFa (wherein M is a transition metal element other than Ni, Co and Mn, Al or an alkaline earth metal element, 0.9?p?1.1, 0.2?x?0.8, 0?x?0.4, 0?z?0.5, y+z>0, 0?q?0.05, 1.9?2?a?2.1, x+y+z+q=1, and 0?a?0.02) to have an average particle size D50 of from 3 to 15 ?m, in a weight ratio of the first granular powder/the second granular powder being from 50/50 to 90/10.

Abstract: A lithium-nickel-cobalt-manganese composite oxide powder for a positive electrode of a lithium secondary battery, which has a large volume capacity density and high safety and is excellent in the charge and discharge cyclic durability, is presented. It is a lithium-nickel-cobalt-manganese composite oxide powder for a lithium secondary battery, represented by the formula LipNixCoyMnzMqO2-aFa (wherein M is a transition metal element other than Ni, Co or Mn, or an alkaline earth metal element, 0.9?p?1.1, 0.2?x?0.5, 0.1?y?0.4, 0.2?z?0.5, 0?q?0.05, 1.9?2-a?2.1, x+y+z+q=1, and 0?a?0.02). The lithium-nickel-cobalt-manganese composite oxide is an agglomerated granular composite oxide powder having an average particle size D50 of from 3 to 15 ?m, formed by agglomeration of many fine particles, and the compression breaking strength of the powder is at least 50 MPa.

Abstract: A positive electrode active material for a nonaqueous electrolyte secondary battery includes at least a lithium-containing manganese layered composite oxide represented by the formula Li1-xAxMnO2, or the formula Li1-xAxMn1-yMyO2. The lithium-containing manganese composite oxide includes a lithium substitute metal A, such as Na, K, Ag, substituting for part of Li. The lithium substitution quantity x may be in the range of 0.03<x≦0.2.

Abstract: A positive electrode active material for a nonaqueous electrolyte secondary battery includes at least a lithium-containing manganese layered composite oxide represented by the general formula Li1-xMn1-yMyO2-&dgr;. The lithium-containing manganese composite oxide is deficient in lithium with respect to the stoichiometric composition of a layered crystal structure represented by the general formula LiMeO2. Part of Mn is replaced by a substitute metal such as Co, Ni, Fe, Al, Ga, In, V, Nb, Ta, Ti, Zr, Ce or Cr.

Abstract: A positive electrode active material for a nonaqueous electrolyte secondary battery includes at least a lithium-containing manganese layered composite oxide represented by the general formula Li1-xMO2-y-&dgr;Fy. The second metallic element or constituent M may be Mn or a combination of Mn and substitute metal such as Co, Ni, Cr, Fe, Al, Ga or In. A lithium deficiency quantity x is in the range of 0<x<1. An oxygen defect quantity &dgr; may be equal to or smaller than 0.2. A quantity y of fluorine substituting for part of oxygen is greater than zero.